Technology|How to adjust the brightness of led display? Introduction of LED display brightness adjustment method

LED display brightness adjustment method

One is to change the current flowing through the LED. Generally, the continuous working current of the LED tube is about 20 mA. Except for the saturation phenomenon of the red LED, the brightness of other LEDs is basically proportional to the current flowing;

Another method is to use the visual inertia of the human eye and use the pulse width modulation method to achieve grayscale control, that is, to periodically change the light pulse width (ie duty cycle), as long as the period of repeated lighting is short enough (ie refresh The frequency is high enough), the human eye cannot feel the shaking of the light-emitting pixels. Because pulse width modulation is more suitable for digital control, almost all LED screens use pulse width modulation to control gray levels today when microcomputers are generally used to provide LED display content.

Advantages of led display

1. Area ductility, if the LCD area is large, it is difficult to achieve seamless splicing. The LED display can be arbitrarily extended and seamless splicing can be achieved.

2. The luminous flux of the LCD plasma screen decays very quickly. Generally, it needs to be replaced after a year and a half of operation, but the LED display screen will be fine for at least five years under the same operating conditions.

3. The LED screen brushing machine can use interactive technology to enhance the interaction between the screen brushing machine as an advertising medium and the advertising audience, such as customizing the touch screen, realizing cloud technology broadcast control management, etc.

Features

1. The LED light-emitting lamp (or single lamp) is generally composed of a single LED chip, a reflector, a metal anode, and a metal cathode, and is covered with an epoxy resin shell with light-transmitting and light-concentrating ability. One or more (different colors) single lamps can be used to form a basic pixel, which is mostly used in outdoor display screens due to its high brightness.

2. The LED dot matrix module is composed of several chips to form a light-emitting matrix, which is encapsulated in a plastic shell with epoxy resin. Suitable for row and column scanning drive, easy to form high-density display, mostly used for indoor display.

3. SMD LED light-emitting lamp (or SMD LED) is the packaging of LED light-emitting light in the form of paste welding. It can be used for indoor full-color display screens, which can realize single-point maintenance and effectively overcome the mosaic phenomenon.

more articles:

Technology | what is the difference between front maintenance and rear maintenance of LED display?